Review of Tinker Tailor Soldier Spy

I am an avid film-watcher, but I could not make out what was happening at all. Although I hate those subtitles that tell you where the action is taking place, I gradually began to miss them as the film went on! A great cast, wonderful feel and colour to the film, cinematography, set design - all excellent. But I would like someone with a pen and paper to explain who was who, and their interconnections........ even which side they were on!!